新Prep-CR-109

alohabrian

109.
                (30048-!-item-!-188;#058&004735)     (GWD 29-Q27 different type)

 

Though sucking zinc lozenges has been promoted as a treatment for the common cold, research has revealed no consistent effect.  Recently, however, a zinc gel applied nasally has been shown to greatly reduce the duration of colds.  Since the gel contains zinc in the same form and concentration as the lozenges, the greater effectiveness of the gel must be due to the fact that cold viruses tend to concentrate in the nose, not the mouth.

Which of the following, if true, most seriously weakens the argument?

A. Experimental subjects who used the zinc gel not only had colds of shorter duration but also had less severe symptoms than did those who used a gel that did not contain zinc.

B. The mechanism by which zinc affects the viruses that cause the common cold has not been conclusively established.

C. To make them palatable, zinc lozenges generally contain other ingredients, such as citric acid, that can interfere with the chemical activity of zinc.

D. No zinc-based cold remedy can have any effect unless it is taken or applied within 48 hours of the initial onset of cold symptoms.

E. Drug-company researchers experimenting with a nasal spray based on zinc have found that it has much the same effect on colds as the gel does.

C怎么weaken了？ 难道 infere zinc也变成缩短cold duration的方法了？C是他因？

alohabrian

UP

ezailshi

结论：ZG的zinc有更强的作用，是因为cold viruses是在nose而不是在mouth

C选项：因为ZL里包含了其他成分，影响了zinc的chemical activity，所以出现一种可能情况：cold viruses是在mouth里，但ZL的zinc不能很快发挥作用，而ZG的zinc可以从nose游走到mouth里起作用，给人感觉上cold viruses是在nose。

C选项起到割断因果的作用。

alohabrian

这么恶搞啊，ZL的效果因为 其他 ingredients的存在而加强，所以nose里的ZL,杀掉了mouth里的细菌？

guni霖

我觉得应该是要证明不是因为cold在nose而导致的gel比lozenge强  
c选项是说有其他元素干扰zinc作用的发挥，所以gel比lozenge强，是其他原因导致结果